An Added Benefit of Masks During the COVID-19 Pandemic: Ultraviolet Protection.

The widespread use of masks during the COVID-19 pandemic presents a new avenue for protecting the lower half of the face from the harms of sun exposure. The increased social acceptability of masks, which may persist post-pandemic, has the potential to impact prevention of photosensitive disorders, photoaging, and skin cancer. The authors sought to review clinically relevant information on the ultraviolet (UV) shielding properties of masks. This synthesis of current research will help physicians counsel patients on optimal mask choices, from both dermatological and public health viewpoints. The variables impacting the UV protection of masks were reviewed, including fabric type, construction, porosity, and color. Other factors related to wear and use such as moisture, stretch, laundering, and sanitization are discussed in the context of the pandemic. Black, tightly woven, triple-layered polyester cloth masks were determined to be optimal for UV protection. The most protective choice against both SARS-CoV-2 and UV radiation is a medical mask worn underneath the aforementioned cloth mask. In order to preserve the filtration capacity of the fabric, masks should be changed once they have become moist. Washing cotton masks before first use in laundry detergents containing brightening agents increases their UV protection. Overall, cloth masks for the public that are safest against SARS-CoV-2 are generally also the most protective against UV damage. People should be encouraged to procure a high-quality mask to simultaneously help reduce the spread of SARS-CoV-2 and shield against sun exposure. Further investigation is needed on the UV-protective properties of medical masks.